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Prospectus [Line Items] rr_ProspectusLineItems  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
Principal Funds, Inc.
Supplement dated June 17, 2024
to the Prospectus and Statement of Additional Information
both dated March 1, 2024
(as previously supplemented)
This supplement updates information currently in the Prospectus and Statement of Additional Information. Please retain this supplement for future reference.
The changes described below are being made to the Prospectus.
SUMMARY FOR INTERNATIONAL FUND I
On June 12, 2024, the Fund’s Board of Directors approved a change to the name of the International Fund I. On July 31, 2024, the International Fund I will change its name to the International Equity Fund. On that date, delete all references in this Prospectus to the International Fund I, and replace with International Equity Fund.
California Municipal Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading California Municipal Fund
Core Fixed Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Core Fixed Income Fund
Core Plus Bond Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Core Plus Bond Fund
Diversified Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Diversified Income Fund
Diversified International Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Diversified International Fund
Equity Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Equity Income Fund formerly Equity Income Fund I
Finisterre Emerging Markets Total Return Bond Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Finisterre Emerging Markets Total Return Bond Fund
Global Emerging Markets Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Global Emerging Markets Fund
Global Real Estate Securities Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Global Real Estate Securities Fund
Government & High Quality Bond Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Government & High Quality Bond Fund
Government Money Market Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Government Money Market Fund
High Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading High Income Fund
High Yield Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading High Yield Fund
Inflation Protection Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Inflation Protection Fund
LargeCap Growth Fund I  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading LargeCap Growth Fund I
LargeCap S&P 500 Index Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading LargeCap S&P 500 Index Fund
LargeCap Value Fund III  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading LargeCap Value Fund III
MidCap Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading MidCap Fund
MidCap Growth Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading MidCap Growth Fund
MidCap Growth Fund III  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading MidCap Growth Fund III
MidCap S&P 400 Index Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading MidCap S&P 400 Index Fund
MidCap Value Fund I  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading MidCap Value Fund I
Money Market Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Money Market Fund
Overseas Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Overseas Fund
Principal Capital Appreciation Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal Capital Appreciation Fund
Principal LifeTime Strategic Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime Strategic Income Fund
Principal LifeTime 2015 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime 2015 Fund
Principal LifeTime 2020 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime 2020 Fund
Principal LifeTime 2025 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime 2025 Fund
Principal LifeTime 2030 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime 2030 Fund
Principal LifeTime 2035 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime 2035 Fund
Principal LifeTime 2040 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime 2040 Fund
Principal LifeTime 2045 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime 2045 Fund
Principal LifeTime 2050 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime 2050 Fund
Principal LifeTime 2055 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime 2055 Fund
Principal LifeTime 2060 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime 2060 Fund
Principal LifeTime 2065 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime 2065
Principal LifeTime 2070 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime 2070 Fund
Principal LifeTime Hybrid Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime Hybrid Income Fund
Principal LifeTime Hybrid 2015 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime Hybrid 2015 Fund
Principal LifeTime Hybrid 2020 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime Hybrid 2020 Fund
Principal LifeTime Hybrid 2025 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime Hybrid 2025 Fund
Principal LifeTime Hybrid 2030 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime Hybrid 2030 Fund
Principal LifeTime Hybrid 2035 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime Hybrid 2035 Fund
Principal LifeTime Hybrid 2040 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime Hybrid 2040 Fund
Principal LifeTime Hybrid 2045 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime Hybrid 2045 Fund
Principal LifeTime Hybrid 2050 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime Hybrid 2050 Fund
Principal LifeTime Hybrid 2055 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime Hybrid 2055 Fund
Principal LifeTime Hybrid 2060 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime Hybrid 2060 Fund
Principal LifeTime Hybrid 2065 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime Hybrid 2065
Principal LifeTime Hybrid 2070 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Principal LifeTime Hybrid 2070 Fund
Real Estate Securities Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Real Estate Securities Fund
Strategic Asset Management Balanced Portfolio  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Strategic Asset Management Balanced Portfolio
Strategic Asset Management Conservative Balanced Portfolio  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Strategic Asset Management Conservative Balanced Portfolio
Strategic Asset Management Conservative Growth Portfolio  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Strategic Asset Management Conservative Growth Portfolio
Strategic Asset Management Flexible Income Portfolio  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Strategic Asset Management Flexible Income Portfolio
Strategic Asset Management Strategic Growth Portfolio  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Strategic Asset Management Strategic Growth Portfolio
Short-Term Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Short-Term Income Fund
SmallCap Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SmallCap Fund
SmallCap Growth Fund I  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SmallCap Growth Fund I
SmallCap S&P 600 Index Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SmallCap S&P 600 Index Fund
SmallCap Value Fund II  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SmallCap Value Fund II
Tax-Exempt Bond Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Tax-Exempt Bond Fund formerly Tax-Exempt Bond Fund I
PFI Prospectus | International Fund I  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY FOR INTERNATIONAL FUND I
Strategy [Heading] rr_StrategyHeading On July 31, 2024, delete the two paragraphs in the Principal Investment Strategies section in their entirety and replace with the below, with the underlined sentences reflecting the change:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities. The Fund invests primarily in foreign equity securities, including emerging market securities. The Fund typically invests in foreign securities of at least ten countries. The Fund invests in equity securities of small, medium, and large market capitalization companies.
The Fund invests in value equity securities, an investment strategy that emphasizes buying equity securities that appear to be undervalued. The Fund also invests in growth equity securities, an investment strategy that emphasizes buying equity securities of companies whose potential for growth of capital and earnings is expected to be above average. The Fund uses derivatives to enhance returns and to manage investment risks. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. Specifically, the Fund uses currency forwards, futures, and options.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities. The Fund invests primarily in foreign equity securities, including emerging market securities.
Risk [Heading] rr_RiskHeading On July 31, 2024, add the following alphabetically under Principal Risks:
PFI Prospectus | International Fund I | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Currency Contracts. Derivatives related to currency contracts involve the specific risk of government action through exchange controls that would restrict the ability of the fund to deliver or receive currency.
•Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
On July 31, 2024, delete the Investment Advisor and Sub-Advisor and Portfolio Managers sections, and replace with the following:
Investment Advisor and Portfolio Managers
Principal Global Investors, LLC
•Paul H. Blankenhagen (since 2024), Portfolio Manager
•George Maris (since 2024), Portfolio Manager
ADDITIONAL INFORMATION ABOUT INVESTMENT STRATEGIES AND RISKS
On July 31, 2024, in the Strategy and Risk Table for the International Fund I (which will be amended to read International Equity, effective July 31, 2024), add an “X” in the row for Derivatives.
PFI Prospectus | International Fund I | Derivatives Risk, Currency Contracts Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Currency Contracts. Derivatives related to currency contracts involve the specific risk of government action through exchange controls that would restrict the ability of the fund to deliver or receive currency.
PFI Prospectus | International Fund I | Derivatives Risk, Forward Contracts, Futures, And Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | International Fund I | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
On July 31, 2024, delete the Investment Advisor and Sub-Advisor and Portfolio Managers sections, and replace with the following:
Investment Advisor and Portfolio Managers
Principal Global Investors, LLC
•Paul H. Blankenhagen (since 2024), Portfolio Manager
•George Maris (since 2024), Portfolio Manager
ADDITIONAL INFORMATION ABOUT INVESTMENT STRATEGIES AND RISKS
On July 31, 2024, in the Strategy and Risk Table for the International Fund I (which will be amended to read International Equity, effective July 31, 2024), add an “X” in the row for Derivatives.